Nut-lock.



No. 840,527. i PATBNTED JAN. 8, 1907;

n. M'.-THOMPSON.

NUT LOOK.

APPLIQATION FILED 20, 190B.

- UNrTEDsTAr s PATENT OFFICE.

OHANNING M. THOMPSON, OF NEWARK, OHIO. NUT-LOCK.

Specification of Letters Patent.

Patented Jan. 8, 1907.

Application filed August 20,1906. Serial No. 331,245.

To alll whom it may concern:

,Be it known that I, CHANNING M. THOMP- SON, a citizen of the UnitedStates, residing at Newark, in the county of Licking and State of Ohio,have invented certain new and useful Improvements in Nut-Locks, of whichthe following is a s ecification.

My invention re ates to nut-locks, and has for its object the provisionof a nut-lock which will effectually retain a nut in position upon abolt against all ordinary strain, jar, or vibration.

Further objects and advantages of the invention will beset forth in thedetaileddescription which now follows.

In the accompanying drawings, Figure 1 is a vertical section of anut-lock constructed in accordance with the invention and illustratingthe same in position to retain a nut upon a bolt, and Fig. 2 is a frontelevation of said nut-lock with a ortion thereof broken away.

Like numera s designate corresponding parts in both figures of thedrawings.

Referring to the drawings, the numeral 5 designates the threaded end ofan ordinary bolt, and the numeral 6 designates an ordinary nut threadedupon said bolt. Threaded upon the outer end of the bolt is a split nutor washer 7, which is angularly formed for the reception of a wrench orlike tool. This nut or washer is' split at 8 and recessed upon each sideof said split portion, as indicated at 9, for the reception of thetrunnions 1.0 of a retaining-dog 11. This retaining-dog has arearwardly-extending tongue 12, which partially overlies the nut 6 whenthe parts are in the position illustrated in full lines in Fig. 1. Atits lower'edge the dog 11 is provided with cutting-face 13, whichterminates in anose 14.

The operation of the device is as follows: The nut 6 having been screwedfirmly into po sition, thedog 1 1 is thrown to the dotted-line positionillustrated in Fig. 1, after which the nut or washer 7 is screwed uponthe bolt 5 until it abuts against the outer face of the nut 6; The dog11 is then driven to the full-line position shown in Fig. 1 by strikingthe tongue 12 with a hammer. This causes the nose 14 and thecutting-face 13 of the retaining-dog to bite into the threads of thebolt, it bemgapparent that this will effectually prevent rotation of thenut or washer 7 with relation to the bolt, which will in turn preventrotation of the nut 6.

By referring to Fig. 1 it will be seen that the distance from the centerof the trunnions 10 to the tip of the nose 14 is slightly greater thanthe distance from the center of said trunnions to the cutting-face 13.The result of thus forming the dog 11 is to cause the split washer toslightly spread when the nose 1 14 first bites into the metal of thebolt. After else the contact of said nose with the bolt would cause thenut to again spread.

. From the foregoing description it will be seen that simple andefficient means are herein provided for accom lishing the objects of theinvention; but whi e the elements shown and described are well adaptedto serve the purposes for which they are intended it is to be understoodthat the invention is not limited to the precise construction set forth,but includes within its purview such changes as may be made within thescope of the appended claims What I claim is 1. A nut-lock comprising athreaded resilient split nut, a retaining-dog pivoted in the splitortion of said nut, sald dog having a cam-s aped cutting edge whichis-adapted to cut into the threads of the bolt upon which the nut isscrewed and which lies in longitudin'al alinement with said bolt, theresiliency of the nut tending to hold said dog in its looking position.

2. In a device of the character described,

the combination with a threaded resilient tion.

In testimony whereof I afliX my signature in presence of two witnesses.

CHANNING M. THOMPSON. Witnesses:

O. O. M. CRUDER, E. M. BAUGHER.

